Rotary milling and slotting machine



0. A. SMITH. ROTARY MILLING AND SLOTTING MACHINE.

' APPLICATION FILED JULY 9. 1919.

4 SHEETSSHEET 1- n or 6 Patented Apr. 19, 1921.

0. A. SMITH.

ROTARY MILLING AND SLOTTING MACHINE.

APPLICATION FILED JULY 9. 1919-.

1,374,962. Patented Apr. 19,1921.

4 SHEETSSHEET 2.

0. A. SMITH. ROTARY MILLING AND SLOTTING MACHINE. APPEICATION FILED JULY 9, 1919.

1,374,962. Patented Apr. 19, 1921;

4 SHEETS-SHEET 3.

- ,Invezzinr By 7218 u lier/ 9 0. A. SMITH. ROTARY MILLING AND SLOTTING MACHINE- APPL ICATION FILED JULY 9,1919.

1,3743962, Patented Apr. 19, 1921.

4 SHEETS-SHEET 4- UNITED STATES AT NTO FIC OSCAR A) SMITH, or CLEVELAND, OHIO, ASSIGNOR T0 rim NATIONALVACME COMPANY or CLEVEL'AND, 01110, A GORIE'QRATION or oruo.

ROTARY MILLING AND SLO'ITING fll/ULCI- IINE;

ToaZZw/wmit may concern:

Be it known that I, OSCAR A. SMITH, a citizen of the United, States, residing-at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain newand useful Improvements in Rotary Milling and Slotting Machines, of which the following is a specification. p

This invention relates to The present improved machine is a horizontal type machine, that is, it is built horizontally and has. the following improvements: 7

A work spindle or shaft secured to and driving the workholdi'ng disk, which shaft is substantially as large in diameters-s the work holdingdisk, and receives its power at the periphery thereof by meansfof a wormdriven worm wheel substantially as, large as the work holding disk. By means of this construction vibration of the shaft and the consequent chattering of the-work or, tool, are practically? eliminated. Not only this, but distortion or weaving of the work relative to the cutter are also eliminated- A fixed cutter shaft powerfullyback-geare'd, v one of which shafts is adjustable toward and from the: other, and in the organization shown, theback-geared cutter shaft is a-fi-Xed shaft while the work shaft isadjustable toward and from the cutter by meansof; an adjustable carrler or slldehaving abored bearing for the reception of the relatively long, large diameter-ed work shaft, the speed; of the work carrying disk and cutter being regulated independently. Inaddition, the peculiar organization of the gearing'for r0 tating the cutter and the work shaft 'is such speed and the WOIk disk at a minimum vibration of the worker weaving thereof, andno chattering thereto. I

metal working machmes, and more particularly to that class that the cutter can berun at a maximum of the tool relatively Specification of Letterslatent. Patented Apl 19, 1921." 1 Application filed. iui 9, 1919.Seria1 No. 309,641.

. One of the great advantages of this improvedmachine is that by reason of its construction and organization a much heavier cutcanabe made with the cutter running at a slower speed than has heretofore been possible, thus [prolongingthe life of the cutter, It has been found in" practice that one of these machines will practically do the .work of twelve standard milling machines, andnot only. this, butthat thecutters will wear longer and the produc-" tionbe very materially increased. 1 1' 1 It is a well known-fact thatin 'thegoperar. tion of the ordinary milling machine on heavy cuts, there is so much'noise made by the cutter due tothe excessive vibration and chattering, that it is practically impossible to hear the humanvoice anywhere near the machine when it is rnnning while the present improved machine during the running thereof is almost noiseless, conclusively provingthat the vibration and chattering has practically been eliminated; by'reason of this improvedorganization of'mechanism, there being no diliicultyin carrying on conversation-close to the maohinein an ordi nary tone of voice. 1

One of the problems arising in this Ina-' chine which had to be worked out and which required considerable study: was that of run niug the cutter atthe'maximum speed and least amount of mechanism and a one-belt" drive, which important ob ect 1s accomlplished 1n the present machine in which the spindle is powerfully back-geared.

Ileretofor'e in all machines of thistype one of the diflicultieshas been to eliminate the chattering of the toolcutter-onthe work andlwhich hasbeen a serious drawbackt'o the "disk ,at the minimum speed with the" production. 'Infthe; present construction} however, the machine is absolutely rigid due largely to the fact that: the relatively long disk, and which worm wheelissubstantially ,as largeas the'workf holding disk while the, J

105 workholding d sk and: lts worm wheel, so

shaft has a large diameter-1 rela tively to the,

thatthe work carrying disk does not, pro iect suliiciently beyond its shaftto cause dis-' tortion or weaving of the work relatively to the cutter and thefrictional resistance of the long, large diametered shaft relatively to its large bearing is also such that the.

on line lt Fig. 3; Fig. 5 is a cross 'sectional view taken on line 55 Fig. 3; Fig. 6 is a front side view of the machine illustrating a part of the cutter shaft mechanism in section; Fig. 7 is a perspective view of the work holding spindle the cutter shaft and the driving mechanism or gearing for actuatmgthese parts; Figs. 8 and 9 are front and side views respectively of the work holding disk, Fig. 8 illustrating the cutter adjacent thereto; Fig. 10 is a detail view of two pieces of work and the clamp which may be used for holding the work in position on the disks, the dotted lines indicating the milled portions; and Fig. 11

shows a completed piece of work, it having been reversed in the disk and the opposite end milled away. Similar characters of reference indicate corresponding parts inthe several figures of the drawings. In the preferred form thereof shown, the

bed 20f themachine is mounted on a pan 1,

which is provided with an oil reservoir. The bed 2 carries a dove-tailed part or guide 3 on which is mounted a slide 4. held in position by means of a suitable key 5 and adjusting screws 5" (see Fig. 6). At right angles to thisdove-tailed guide 3 of the bed 2 the slide 4 is provided witha suitable bore in which. is mounted 'or housed a hollow disk relatively long, large diametered shaft 6. Secured to the rear of shaft 6 is a worm gear 7 in the form of a'ring having a series shown in the present instance. as 6 projections or lugs 7 for the reception of a similar number-of screws or bolts'by means of which the ring gear is clamped or secured to the hollow shaft 6 (see Fig. 1). Directly under this worm gear 7 and at right angles with the shaft 6 and mounted'in suitable tern-of gearing and disconnecting "clutch mechanism 50 are located againstthe side of the bed 2 and arepartly carried at the outer end of the worm shaft 8 and by a stub shaft secured to the side of the bed, a handle 51 for manipulating the clutch being provided.

auxiliary shaft 11 and mounted in suitable.

bearings of the extended housing 52 and a similar housing 53 of the bed 2 is another shaft 15, one end of which carries a beveled gear 16 in mesh with the beveled gear 13.

To the opposite end of this shaft 15 and located in the extended housing or bearing 53 is secured a spur gear 17 in mesh with a spur gear 19 carried by an auxiliary shaft 18 likewise suitably mounted in the housing 53. On this same shaft 18 and adjacent to spur gear 19 is a spur gear 20, which. is in mesh with a spur gear 22 carried by a shaft 21 in alinement with shaft 15. One end of this shaft 21 is supported in the extended housing 530E the bed 2 while the other end thereof has a bearing in and passes through another extended housing 54: carried. by the bed 2, while the inner end of this shaft 21 rests against the face ofspur gear 17. 7 Securedto the shaft 21 within the housing 54 is a spur gear 23 in mesh'with a spur gear 25 carried by a cutter spindle 24, which is located at a suitable angle above and parallel with shaft 21, the spur gear 25 being suitably housed in the extended hearing or housing 54. p

To the] outer end of the cutter spindle 24 is mounted cutter arbor 26 by means of a suitable taper, such as is used in milling'machines. A suitable cutter 26 is mounted on the arbor in' the usual way, viz: with collars and locknut and the cutter arbor has an outer support in an arbor support bracket 27, which is carried by the housing 53 by means of a suitable tongue and bolts; On the outer end of'the shaft 21, which may be designated as the main driving shaft, is secured a suitable'belt pulley 2S, whic'h is shown as a three-speed pulley. To the end the work carrying spindle or shaft oppositetothat to which the worm gear/7 is fastened is secured work disk 29, it being observed that'this shaft and work disk are of substantially the same size. This work disk is machined to suit the -work that is to be milled and the set screws 29 (see Fig. 9)

clamp in conjunction with theiclamps 29" the work in position'to be milled' For adusting the slide 4 and the work carrying disk 6 toward and from the cutter a suitable s'crew 30 and hand wheel 31 are pro-' v ded. the screw being'suitably mounted in the slide 4 and on the bed 2 (see Fig. 5).

From 'the foregoing, it will be observed that power being imparted to the pulley 28 on the main drivingshaft 21,'such power is transmitted from spur gear 23 'to spur gear 25 and thereby drives the cu'tterspindle24 and thereby the cutter arbor 26 and the cutter 26 to revolve the cutter in thedirection of change speed gearing 5O drives the .worm' 9land thereby the worm wheel carried by the'work spindle or shaft 6, .thespeedof the; shaft 6 being regulated by the change speed; H

I 29' carried by the milling chuck ring, 011

gearing 50.

A suitable oil pump 39 is ca ried. by the bed 2 and is driven by a pair of gears {10 and 41, the gear 140 being secured tothe pump shaft while the gear 41 iscarried'by'and receives its power, from the auxiliary shaft 18.

. In the operation of the machine, a suitably formed work carrying disk ismonnted on the work carrying shaft orspindlefiand a suitable cutter is mounted on'the arbor 26 the work being held in position on this disk by means of either aysets crew or a swivel clamp according to the character of thepiece of work to be'operated upon.

" The speed of the 'cutter in relation to the speed of the work carrying'disk varies, and this is taken'care'of by meansof the threespeed pulley 28 andthe change gear system, thethree-spee'd 'belt pulley regulating the speed of thef'cutter while the change-gear system regulates the speed of the work carrying disk. The work carrying disk feeds toward the cutter, i. e. rotates downwardly while the cutter rotates away from or upwardly as indicated by the arrows The depth of the cut is regulated by the adjustable screw 1 and hand wheel 31. By means of the system of four spurgears' 17 19, 20 and'22 in connection with the worm and worm wheel and change gear system 50 the speed of the work carrying disk may be i reduced to the minimum required for anything that canfbe milled in thismachine.

The present improvement enables the cutter to be run at a maximum speed and the work carrying .disk' at the minimum speed,

with theleast. amount of mechanism and a one-belt drive, which ashereinbefore stated,

was a problem which required considerable study beforeit was worked out.

It of. course will.be understood that the various details may be more or less. changed without departing from the spirit or scope of the invention as expressed in 'theclaims, Referring to Fig. 9, the work carrying" consideredKas forming the .work

disk comprises what may be considered as the milling chuck, whichis in'the form of a ring 29 constructed to fit oVer-aprojecting portion of the revolving shaft and is secured thereto by suitable screwsso thatthis work disk or chuck will have a bearing upon the revolving shaft. In other words,

will fit'into themillingchuck 29 and likewise has bearing, therein "and is secured theretoby suitable screws. 'The set screws work holding disk serve to secure the'clamps 29" against the work 'which turn hold the workin the spaces provided in the chuck 29. The. chuck or work holding disk and the clamping oriinilling chuck ringmay holding means or work holdingdisk.

The 5 and} fro movement and also the 5 up and down movement of the cu tt'ersfand' the work when this present is familiarly 95.

known to mechanicsas,weavingand this is the" meaning fof the term as used herein, and it "is this weaving which the present improvement"eliminates. 1

I claim as my invention: 7, g 1. In a millingand slotting machine, the

V combination of rotary "work holding means,

a'rotary shaft ofrelatively largefdiameter carrying said work'holding means,;a rotary cutter supported at one side'of said shaft, means for feedingsaid" work holdingv shaft sidewise toward and from the cutter, and means for rotating the cutter and shaft and including a single belt driven differential speedpulley, the fshaft'at a low speed. as compared with the. high speed of the cutter.

iob

2; In a mining and slotting machine, the

combination ofl r'otary "work holding means, a rotaryfshaft' of relatively large diameter carrying said work hold-in "meansfa rotary cutter. supported at one s de of said shaft, means for feeding said work holding; shaft sidewise toward and from the cutter, means for rotating the cutter. and shaft, the shaftat alow speed comparedwith the high speedfof; the cutter-{said last. means comprisinga "single lbelt. differential pulley-driven shaft, a direct Q drive 'therefrdm to the cutter;

and an indirect. drive'to holding shaft. l

T3. In a imilling and'*slotting' machine, the combination of a rotary work holding disk, a rotary ,shaftcarrying said were holding" disk and of large diametei' relatively thereto whereby the disk does not extend sufficiently beyond the shaft to cause distortion or weav:

ing of the work-relatively tovthe cutter a rotary cutter, means for operating said shaft and cutter comprising a direct drive 'to, said cutter, and a variable indirect drive to. said shaft,- saidcutterbeing rotated: at high speed as compared to the low speedof-the work holding means. i

1 t. In a milling and slotting machine, the combination of a rotary work holding disk, a rotary shaftcarrying said disk andlof large diameter relatively thereto whereby the diskv does not extendsufiiciently beyond theshaft to cause distortion or weaving of the work relatively totthe. cutter, a-rotary cutter, a fixedshaft for supporting the same, means for operating said: shafts comprising a powerful back-geared direct drive ,tothe cuttershaft, and avariable indirect drive to said work shaft, said cutter being rotated at abig'h speed as compared to the low/speed of-the work holding means, and means for shifting said rotary work. shaft ,towardand from the cutter. v I

5. V In a milling and slotting machine, the combination of rotary work holdingmeans, a rotary shaft of relativelyelarge diameter carrying said work holding means, a rotaryv cutter supportedat one side of saidshaft, means for feeding said work holdingshaft sidewise toward and fromthe cutter, means for rotating the cutter and shaft, the shaft at a low: speed as comparedwith the high speed of the cutter, said last means comprisinga differ ential pulley belt driven shaft,a direct drive therefromto the cutter, an indirect drive to thework holding shaft, said indirect drive comprising a system of. spur gears, worm wheel mechanism, and change speed gearlng, sa d work holding, shaft havlngthe power transmitted thereto vat-the periphery of the.

rear end. 6. In ahorizontal type-milling andslotting machine, the combination of,a' work holding disk, a rotary shaft secured thereto and having substantially the same diameter as :said work holding disk, a'rotary cutter, means for rotating-saidcutter, and means for supportingsaidworkholding shaft for movement toward and from the :cutter, and means for rotating said work holding shaft.

7. In a' horizontal type milling. and slotting machine, the combination of a :work holding disk, a rotaryshaft secured thereto and having substantially the same diameter as said work holding disk, a rotary-cutter, means for yrotating said rcutter, and ,means for: supportingv said work holding shaft: for movement toward; and from the cutter, and

means for rotating said work holding shaft,

said means including aaworm'andworm wheel, the latter carriedby and at the rear of said work holding sha V v i .i

8.: In a milling and slotting machine, the combination of awork holding disk, a shaft for driving the same hiWlng: substantially the diameter of-said disk,.means for transmitting; power to the periphery of saidshaft, a rotary cutter carrying spindle, means for adjustably .supportingisaid. disk and shaft for movement toward and from the cutter,

and means for,regulatingthe speed.of the cutterand of thework carrying disk independently.

.9. In amilling and slotting'machina the combination of a work carryingdisk, a sha'ft therefor having substantially the same. diameter as said disk, means for driving said shaft at the periphery thereof and comprlsing asystem of-spur gears, worm wheel mechanism, and-change gear mechanism.

' IOLInQamilling and slotting machine, the

combination off a work carrying ;dis k, alhollow shaft therefor havin substantiallythe same diameter as said dis means fordrlving. said shaft at the periphery thereof andcomprising a1 system of spur gears, [worm wheel mechanism,.and change gear mechanism, said worm wheel-mechanism comprisreal:

ing a ring worm wheel securedto the end of said hollow shaft' .11. In a milling andslotting machine, the.

combination ofawork carrying disk, a'shaft therefor having substantially the same 'diameter as said disk, means for driving; said shaft at;the periphery thereof and comprising-a system ,ofjspurfgears, worm wheel mechanism, change gear mechanism, a cutter carrying spindle, and means for driving said spindle inthe same direction as sald shaft,.the main driving means for said spin-, dle and the workcarrying shaft being prithereon, an adjustable slide mounted on said bed,means for adjusting said slide, a work carrying disk, a shaft carrying said disk and having substantially the same diameter as said diskanld carried by saidadjustable slide, means for driving saidishaft at the periphery thereof and comprising a worm wheel mechanism, a system of change gears,

a system of spur gears, a differential belt pulley driven shaft for driving said spur gears, a cutter driving shaft, and means for driving the. same from said belt driven shaft.

14. In minin and slotting machine, the

combination of a work holding disk, a hollow sha'ftfor driving the same having sub stantially the diameter of said disk, a slide 'for supporting said shaft, means for adjustingsaid slide transversely of the axis of said shaft, a worm wheel carried at the peripheral rear end of said shaft, a worm in engagement with said worm wheel, a

crosswise I extending shaft carrying said worm, change speed gears located at one end of said last shaft, an auxiliary shaft, spur said main driving shaft and cutter shaft.- g

r and said rotary work shaft whereby the cutfiter shaft-is rotated atahigh speed and the work holding shaft at a low speed,

ferent speeds.

gears between said auxiliary shaft and worm shaft, a shaft extending transversely ofsaid auxiliary shaft, bevel gears between said last shaft and auxiliary shaft, a main driving shaft,'a differential speed belt pulley at one end thereof, a shaft extending in paral- ,lelism with said main driving shaft, a set of spur'gears between said main driving shaft, said last shaft and said bevel gear shaft, a cutter shaft, andspur gears between 15. In a milling and slotting machine,the

jc0mbination: of rotary work'holdin means, ,a-rotary shaft therefor of relative y large diameter, a cutter carrying shaft, means for feedin one of .said shafts transversely of cutter shaft, and ajsystem of speed re ucing gearin between saidprimary driving shaft 16. In avmilling and slotting machine, the combination of rotary work holding means, a rotary shaft of relatively large diameter,

-means for feeding s'aidi shaft transversely N of the axis thereof, acutterdriven shaft, means for rotating the cutter at a high speed and for rotating the work holding shaft at 4 a low speed and comprising a primary driving shaft, and means for rotating it at dif- 17 Ina milling machine,the

combination of rotary work holding means,

a rotary shaft of relatively, large diameter,

means for feeding .said shaft transversely of the axis thereof, va Lcutter driven shaft,

low speed andcomprising a primar means for rotating the cutter ata high speed and for rotatingthe work holding shaft at a driving shaft, means ;for.rotating it at different speeds, said primary driving shaft carrying means for rotatingthe cutter shaft and also -means for imparting rotation tothe work holding shaft, said last meanS,,c0mpr1s1ng .a system of spur gears,;a worm wheel :mech

" anism", and a change gear mechanism, said endof the work holding shaft, i

worm wheel mechanism comprising a ring worm wheelcarrled at the peripheral rear 18. In a milling'andslotting' machine,the

. combination of rotary work holding means,

.a rotary shaft having substantially the same 1 6 diameter as and carrying said work holding means, a rotary cutter supported at one side of said shaft, means for feeding said cutter and shaft one relatively toward and from the other, and means for rotating the cutter and shaft, one at a low speed and the other atahihspeed.

a 19. n a milling and slotting machine, the combination of rotary work holding means,

a rotary shafthaving substantially the same diameter as and carrying said work holding means, a rotary cutter supported at one side of said shaft, means for feeding said cutter and shaft one relatively toward and from v the other, andmeansfor rotating the cutter and shaft, the shaft at alow speed and the cutter at a high speed. c 1 s 20. In a milling and slotting combination of a work holding disk, a shaft for driving-the same having substantially the diameter or, said disk, means for transmitting power to the periphery of said shaft,

a rotary cutter carrymg spindle, means for adjustably supporting said disk and shaft 7 for sidewise movement relatively one to the other, and means for regulating the speed of the cutter and of the work carrying disk independently. i i v 2 e 21. In a milling andslotting machine,the

combination of a work carrying disk, a shaft therefor having substantially the same diamleter as said disk, means for driving said shaft atthezperiphery thereof and comprismg a systemof spur'gears, worm wheel mechan1sm,change ear mechanism, a mam driv 7 ing shaft,a difierential belt pulleymounted 1 on said maindriving shaft, a cutter carrying spindle, meansfor driving saidspindle,'the

main driving means for the spindle and for .the work carrying shaft being primarily the same, the speed of the work carrying g shaft being regulated by the change gear system and the speed-of the cutter carrying spindle by the belt pulley, and means for feeding said shaft and cutter carrying spindle sidewise one relatively to the other.

'22. In a machinezof the class described,

,the combinationof a rotary shaft, work holding means secured thereto, a worm wheel also secured thereto, saidishaft having a diameter substantially as large as the wormwheel and work holding means, means for rotating said shaft through said worm the combination of a shaft,,workgholding means secured thereto at one end, a worm Qwheel alsosecured thereto vat its-opposite 1 end, said shaft having a diametersubstaxr' "tially as large as the worm wheel and the work holding imeans,-,means for rotating saidshaft through said worm wheel, a cutter shaft, a cutter thereon, means forrotating machine, the

said cutter shaft, the rotating means for the cutter shaft and the worm wheel shaft comprising a primary driving shaft, and means for shifting the worm wheel shaft and cutter shaft one relativelyto the other.

24. In a machine of the. class described, the combination of a rotary shaft, work holding means secured thereto, a worm,

wheel also secured thereto, said shaft having a diameter substantially as large as the worm wheel and work holding means, means for rotating said shaft through said worm wheel, a cutter shaft, a cutter thereon, means for rotating said cuttersshaft, means for shifting said worm wheel shaft and cutter shaft one relatively to the other, and means for varying the speed of the worm wheel shaft relatively to'thatof the cutter shaft. I

25. In a milling and slotting machine, the combination of a work holding disk, a relatively long shaft carrying said disk, supporting means having a bearing for re ceiving said shaft, a rotary cutter,'means for rotating the cutter, means'for shiftlng the cutter and work shaft relatively to each other, gearing for rotating the work holding shaft and including a peripheral gear adjacent to the end opposite to sald disk and having a diameter substantially the same as the work holding disk, said shaft having a large diameter relatively to said diskand peripheral gear whereby the fric' -tional resistance thereof is increased relacutter and work shaft relatively to each other, gearing for rotating the work holding shaft and including a peripheral gear adjacent to the end opposite to said disk and having a diametersubstantially the same as the work holding disk, said shaft having a diameter substantially as large as said disk and peripheral gear whereby the frictional resistance thereof is increased relative to its bearing and the chattering or vibration and weaving of the work relatively to the cutter are practically eliminated, the means'for rotating the cutter and work holding disk being so organized as to rotate the cutter at a high speed and the disk at a relatively slow speed. c

27. In a machine of the class described, the combination of a shaft, work holding means secured thereto, a worm wheel also secured thereto, said shaft having a diameter substantially as large as said worm wheel and work holding means, means for rotat- 29. Ina machine of the class ing" said shaft through said worm Wheel and comprising a :primary driving shaft, and a system of reducing variable speed gears between said primary shaft and said shaft one relatively to the other.

28. In a machine of the class described, the combination of rotary work holding large diameter, a cutter shaft, means for feeding one shaft toward and from the other, a primary driving shaft, gearing between said primary driving shaft and cutter shaft, and a system of reducing speed gear ing between said primary driving shaft and work holding shaft. a l 4 described, the combination of a'primary driving shaft, a single belt driven differential speed pulley thereon, a small diameter spur gear secur'ed to said shaft, a cutter sha-ft in parallelism with said driving shaft, a' large diameter spur gear secured to said cutter shaft'and in'mesh with said small spurgear, acutter sec'uredto said cutter shaft, a rotary work holding shaft in parallelism with said primary driving and cutter shafts, work holding means and a worm wheel carried by said last shaft, the said work holding shaft, work holding meansan'd worm wheel all having substantially the same diameter, a worm shaft extending transversely of the work holder shaft-and having a worm in mesh with said worm wheel, gearing connecting said worm shaft and primary driving shaft and including 'variable speed gears, and change speed gearingfor the Worm shaft. r r

30. In a machine of the. class described,

the combination ofa primary driving shaft,

a single belt driven differential speed pulley thereon, a small diameter spur gear carried by said primary driving shaft, a cutterfshaft in parallelism with said primary driving shaft, a large spur gear securedthereto and in'mesh with said small spur gear,'acutter secured to said cutter shaft, a rotary work holding shaft in parallelism with said driving and cuttershafts, work holding means and a worm wheel carried by said last shaft,

said work holding shaft, work holding means and worm wheel'all havingsubstantially the same diameter, a worm shaft extending transversely of the work holding shaft and having a worm in mesh Withsaid worm wheel, an auxiliary shaft parallel with and gear-connected to said worm shaft,

' a shaft in 'alinement with said primary driving shaft and gear-connected WlthSiLldftllX- iliary shaft, and variable speed gearing between said primary driving shaft and its -means, a rotary shaft therefor of relatively alined shaft, the organization being such that the cutter is driven at a high speed and the work holding shaft at a low speed, said speeds being variable relatively to each other. 7

31. In a machine of the class described, the combination of a rotary shaft, work holding means secured thereto, a worm wheel also secured thereto, said shaft having a diameter substantially as large as the worm wheel and work holding means, means for rotating said shaft through said worm wheel, and including a pair of shafts, one extending transversely to said rotary 15 shaft and the other transversely to said last shaft and projecting beyond said rotary shaft, 'a cutter shaft having the major part thereof likewise projecting beyond said rotary shaft and in arallelism with that part of said shaft which projects beyond said rotary shaft, a cutter on said cutter shaft, means for rotating said cutter shaft at a speed greater than the speed of the rotary shaft, and means for shifting said rotary shaft and cutter shaft one relatively to the other.

Signed at Cleveland, county of Cuyahoga and State of Ohio, this 3rd day of July,

OSCAR A. SMITH. 

